Abarcar, J. C. (1975). A study of the validity and reliability of the 1861 D.E. National Examination in economics [microform]. Photoduplication Service. University of the Philippines Library.
Lua i Stíl Chicago (17ú heag.)Abarcar, Jose C. A Study of the Validity and Reliability of the 1861 D.E. National Examination in Economics [microform]. Quezon City: Photoduplication Service. University of the Philippines Library, 1975.
Lua MLA (9ú heag.)Abarcar, Jose C. A Study of the Validity and Reliability of the 1861 D.E. National Examination in Economics [microform]. Photoduplication Service. University of the Philippines Library, 1975.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.